They have watched big critics of the brash businessman, like former Texas Gov. Rick Perry and Sen. Marco Rubio (R-Fla.), capitulate and join the Trump cause. And they have failed to draft a credible independent candidate to challenge Trump and deny him the presidency in a matchup against Hillary Clinton.

But for all of the polls showing that much of the GOP electorate is backing Trump, most of the holdouts still staying true to their pledge.

Here’s a list of the most prominent members of the #NeverTrump movement, which The Huffington Post will update throughout the campaign: